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The Finite Element Analysis of the Mechanism of DMT and the Application of DMT on Compaction Control

Author: LuoSong
Tutor: XuChaoï¼›GaoYanBin
School: Tongji University
Course: Geological Engineering
Keywords: Flat dilatometer tests Penetration finite element simulation Diaphragm expansion Ground treatment Results Verification
CLC: TU470
Type: Master's thesis
Year: 2006
Downloads: 163
Quote: 0
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Abstract


Flat dilatometer tests with simple operation, economy, good reproducibility, and little disturbance can get a multiple of Soil Parameters obtained approximate continuous stratigraphic section, etc., has been widely used in foreign geotechnical survey and design. Based on nearly two decades of practical experience in engineering, flat shovel to the side of inflation during the test and its application in geotechnical engineering systematic summary. Include the following aspects: determining of soil parameters, to predict the settlement of shallow foundations, testing the effect of reinforcing rock detection clay slope sliding failure surface, predict the traits of laterally loaded piles determining sand liquefaction determine solid junction coefficient, permeability coefficient, numerical analysis provided Soil Parameters and comparison with other in situ tests in the application of the flat dilatometer tests. Flat shovel the side bulge test pilot mechanism for deeper analysis in this article from the actual flat shovel testing process, the numerical simulation analysis in ANSYS software the DMT penetration test process. Adopt more closely the Soil model as well as boundary conditions, in order to achieve the ideal state is more in line with the field penetration. The soil is considered to be saturated, and found the bilinear isotropic elastic model, whereas the flat shovel head and probe injectites equipment is set to the non-deformable solid. By detectors surrounding soil at the bottom of the stress strain change, soil disturbance situation brings different penetration detail. Through an appropriate air pressure is applied to the calibration of the diaphragm in the program, so the displacement of the center of the level just reaches 1.1mm, the establishment of the the diaphragm expansion process numerical model. Comparative numerical simulation with Marchetti recommended empirical formula to calculate the difference between the compression modulus values, as well as the calculation of stress distribution analysis of numerical simulation with the pure elastic solution, last initial derivation lateral coefficient of subgrade foundation soil. The final chapter describes the the application flat dilatometer tests conducted comprehensive analysis and evaluation, and inspection of the Expressway soft ground treatment effect achieved some results. Combined with a long board - short pile construction method composite foundation of the conceptual model and the basic theory, based on flat shovel side inflation test of the test results of the construction method of reinforcement mechanism carried explore and description of foundation soil engineering performance in different periods of the change in the law, as flat dilatometer tests provide a reference application of geotechnical engineering.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > The foundation and basis for the theory and computational
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